<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>一个小球</title>
  <style>
    canvas{
      border:1px solid #ddd;
    }
  </style>
</head>
<body>
<canvas id="canvas" width="400" height="300"></canvas>
<script src="globule.js"></script>
</body>
</html>